1 //===-- llvm/Support/DJB.h ---DJB Hash --------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains support for the DJ Bernstein hash function. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_SUPPORT_DJB_H 15 #define LLVM_SUPPORT_DJB_H 16 17 #include "llvm/ADT/StringRef.h" 18 19 namespace llvm { 20 21 /// The Bernstein hash function used by the DWARF accelerator tables. 22 inline uint32_t djbHash(StringRef Buffer, uint32_t H = 5381) { 23 for (unsigned char C : Buffer.bytes()) 24 H = (H << 5) + H + C; 25 return H; 26 } 27 28 /// Computes the Bernstein hash after folding the input according to the Dwarf 5 29 /// standard case folding rules. 30 uint32_t caseFoldingDjbHash(StringRef Buffer, uint32_t H = 5381); 31 } // namespace llvm 32 33 #endif // LLVM_SUPPORT_DJB_H 34
